Device for determining the specific gravity of liquids



NOV. 17, 1931. s c s 1,832,792

.DEVICE FOR DETERMINING THE SPECIFIC GRAVITY OF LIQUIDS Filed July 27, 1926 Fig.3 9 I Fig.2 a

I A Q Mb sure the float against Patented Nov. 17, 1931 UNETED STATES PATENT QFFICE EDGAR SACHS, OI STUT'IGART, GERMANY, ASSiGHOIR T ROBERT BOSCH A LTIEN GESELLSCHAFT, 9F STUTTGAET, GERMANY DEVICE FOR DETERMINING THE SPECIFIC GRAVITY OF LIQUIDS Application filed July 27, 1926, Serial No. 125,293,:1116. in. Germany October 26, 1925.

The invention relates to instruments for measuring the specific gravity of liquids, and particularly for measuring the density of liquids in electric batteries.

Hitherto the float or hydrometer proper was provided with projections, by means of which the float was to be guiued in its vessel or housing. In a suitable constructional form of the housing said projections can inrotary movements, which would render ditlicult the reading oil of the graduation of the float.

However said projections make the float e pensive, and render it liable to break; ii 'ther it is diflicult to make said projections sufficiently exact in measure. These drawbaclrs are avoided according to the present inven tion by providing the float with outer edges extending in the longitudinal direction of the Such glass shapes can be produced easily and exact in measure by a plurality of known methods. The float for instance can have the shape of a triangular or square prism, while the housing may be cylindrical.

L') Advantageously however the housing too is provided with inner guideways, extending also in the longitudinal direction of the same so that the float is guided by its outer edges in the inner guideways of the housing, where- :L.; by it is insured against rotary movements.

In the accompanying drawings in which a preferred form of construction of the device, which. can be used simultaneously as a syringe, is illustrated Fig. 1 shows a longitudinal section through the whole device, while Fig. 2 is a cross section on line A;J of Fig. 1, and

Fig. 3 a cross section on line 0-D of Fig.

1 i As it may be seen from Fin. 2 the float a l I) in cross section has the shape of an equilateral triangle and the lower part of the pipette-like glass tube 7) in cross section has the shape of an equilateral hexagon. Each l longitudinal edge oi the float a is guided in a longitudinal guideway of the tube Z), while the ascenslon of the liquid is effected in the intermediate space formed by the three remaining corners of the tube 6.

As glass cylinders having a polygonal cross sectional shape can be produced with great exactness, floats and housings can be easily exchanged, which however is not possible in the devices known up to now on account of the slight exactness of measure of the present floats.

It will. be apparent, of course, that numer ous changes may be made in the particular embodiment herein shown without departing from the spirit andscope oi the invent-ion.

I claim:

Device tor determining the specific gravity oil liquids, which comprises in combina tion, a housing and a. hydrometer float arranged in housing, said float being polygonal in cross section and said housing being also polygonal in cross section, the total number of the sides of the polygon represented by a cross section of said housing being a multiple of the number of sides of the polygon represented by a cross section of said float, the edges of the float extending into and being guided by corners of said housing.

:2. Device for determining the specilic gravity of liquids claimed in claim 1, in which the sides of the polygon, representing a cross section of the float, are substantially coincident with lines joining alternate vertices of the polygon representing a cross section ot said houseing.

3. Device for determining the specific gravity of liquids, which comprises in combination a housing and a hydrometer float arranged in said housing, said float having a triangular cross sectional shape and said housing havin in its lower half hexagonal cross section shape, in which each edge of said float is adapted and arranged to be guided longitudinally by guideways formed in the interior of the lower half of said housing by the inter section of its sides at alternate vert' es of said hexagonal cross section.

In testimony whereof I have hereunto affixed my signature. 

